JP7024656B2 - motor - Google Patents

Description

The present invention relates to a motor that supplies power to a coil via a wiring board.

In a motor in which a stator and a rotor are housed in a motor case, the winding of the coil wound around the salient pole of the stator core and the lead wire for power supply are connected to the wiring board, and power is supplied to the coil via the wiring pattern on the wiring board. There is something to do. Patent Document 1 discloses this type of motor. In the motor of Patent Document 1, the pin terminal is passed through the hole of the wiring board, and the winding is entwined with the pin terminal to connect the winding to the wiring board.

Since a high output motor or a motor with a low applied voltage has a large winding diameter, it is not possible to entangle the winding with the pin terminal. Therefore, it is not possible to adopt a structure in which the winding is connected to the wiring board using pin terminals. Patent Document 2 discloses a structure in which a winding is connected to a wiring board without using a pin terminal. In the motor of Patent Document 2, a groove-shaped drive coil insertion portion is provided at the outer peripheral end of the wiring board, and the winding is passed through the groove (drive coil insertion portion) and soldered to the wiring board. The groove extends linearly in the radial direction, and the winding extends from the groove to the land on the inner peripheral side and is soldered to the land.

Japanese Patent No. 3804398 Japanese Unexamined Patent Publication No. 9-322497

In the motor of Patent Document 2, the winding wire drawn from the coil is drawn out in the axial direction of the stator at the outer peripheral end portion of the stator and passed through the groove (drive coil insertion portion) of the wiring board. When connecting the winding to the wiring board, first, the winding drawn from the outer peripheral end of the stator to the side where the wiring board is arranged is tilted to the outer peripheral side to secure a space for arranging the wiring board. .. Then, after arranging the wiring board, the winding is raised, passed through the groove, and soldered.

When the windings are connected by such a method, by tilting the windings to the outer peripheral side, the windings have a habit of trying to return to the collapsed shape. Therefore, even if the winding is raised and put into the groove, the winding tends to return to the outer peripheral side, so that the winding tends to come off from the groove. In particular, when the winding diameter is large, the stress for returning to the collapsed shape is strong, so that the winding easily comes off from the groove. Therefore, the winding must be pressed and soldered, resulting in poor workability. In addition, the winding may come off the land after soldering.

In view of the above problems, an object of the present invention is to provide a motor capable of connecting a winding to a wiring board without using a pin and easily connecting the winding to the wiring board. There is something in it.

In order to solve the above problems, in the present invention, a stator core having a plurality of salient poles, a stator having a coil wound around each salient pole via an insulator, and a drive current supplied to the coil flow. It has a wiring board that connects the feeding line and the winding of the coil, and the wiring board has a locking portion in which the winding is locked and a land on which the winding is soldered. The first locking portion is provided and is cut out from the outer peripheral end of the wiring board toward the inner peripheral side.
A through groove and a second through groove connected to an end portion on the inner peripheral side of the first through groove are provided, and at least a part of the second through groove is opposite to the side at a position connected to the first through groove. It is characterized in that it extends in the direction toward the outer peripheral side of the wiring board toward the side.

According to the present invention, the winding is soldered to the land in a state of being locked to the locking portion of the wiring board. Therefore, since it is not necessary to entangle the winding with the terminal pin, the coil and the feeder can be connected by using the wiring board even if the winding has a large winding diameter. Further, the locking portion includes a first through groove extending from the outer peripheral end of the wiring board to the inner peripheral side, and a second through groove connected to the inner peripheral end of the first through groove. At least a part of the wiring board extends toward the outer peripheral side of the wiring board toward the side opposite to the side connected to the first through groove. As described above, if at least a part of the second through groove has a shape toward the outer peripheral side of the wiring board, it is possible to prevent the winding from coming off from the locking portion by inserting the winding into the second through groove. That is, when the winding has a habit of tilting toward the outer peripheral side, the winding is urged to the side opposite to the position where it is connected to the first through groove, so that the winding is urged to the first through groove. Return is suppressed. Further, even when the winding does not have a habit of tilting toward the outer peripheral side, the movement of the winding in the circumferential direction is suppressed in the second through groove. Therefore, since the winding is difficult to move in the second through groove, the winding is suppressed from returning to the first through groove. Therefore, since there is little possibility that the winding will come off from the locking portion, the soldering work is easy and the work of connecting the winding to the wiring board is easy. For example, after locking a plurality of windings to the locking portion, soldering can be performed collectively. Therefore, it is possible to efficiently solder a plurality of windings.

In the present invention, it is preferable that the land is provided on the edge of the second through groove and is connected to a conductive portion provided on the inner surface of the second through groove. In this way, the winding can be easily brought into contact with the land by tilting the winding. Further, the pattern provided on each layer of the wiring board and the winding can be electrically connected via the conductive portion. Therefore, the current capacity can be increased. Further, since the winding can be soldered not only to the land but also to the inner surface of the second through groove, the fixing strength of the winding can be improved.

In the present invention, the wiring board preferably includes a through hole formed in a region surrounding the locking portion. In this way, the pattern of each layer on the wiring board and the winding can be electrically connected via the through hole. Therefore, the current capacity can be increased.

In the present invention, the position where the first through groove and the second through groove are connected is preferably a position which overlaps with a pull-out position where the winding is pulled out from the coil when viewed from the axial direction of the stator. In this way, the winding can be easily inserted into the second through groove. Therefore, it is easy to hold the winding in the second through groove. In addition, it is difficult for the winding to return to the entrance side of the first through groove. Therefore, the winding is hard to come off from the locking portion. Therefore, the soldering work is easy, and the work of connecting the winding to the wiring board is easy.

In the present invention, the insulator includes a wall portion arranged on the outer peripheral side of the coil, and the wall portion includes a concave groove in which the winding wire drawn out to the outer peripheral side of the wall portion is arranged. It is preferable that the groove overlaps with the first through groove when viewed from the axial direction. By doing so, it is possible to prevent the insulator and the winding from interfering with each other when the wiring board is arranged by tilting the winding toward the outer peripheral side. Further, since the concave groove and the first through groove overlap each other when viewed from the axial direction, the winding can be easily inserted into the first through groove.

In the present invention, the winding is tilted toward the tip end side of the second through groove, extends in the extending direction of the second through groove in the second through groove, and at least a part of the land is formed. It is preferable that the second through groove is provided on the tip end side. In this way, the windings are arranged in the second through groove in a state of being tilted with respect to the plate thickness direction of the wiring board, so that it is necessary to bend the windings at a substantially right angle in order to bring the windings into contact with the land. It is enough to bend it at an obtuse angle. Therefore, since the stress applied to the winding is small, the soldered winding is hard to come off. Further, when the conductive portion is provided on the inner surface of the second through groove, the contact area with the conductive portion can be increased by tilting the winding in the second through groove. Further, since the winding extends in the extending direction of the second through groove in the second through groove, the second through groove has a large range to be closed by the winding. Therefore, there is little possibility that solder will drip from the second through groove to the stator side.

In the present invention, the wiring board is provided with a plurality of winding connection portions having the locking portion and the land, and the second through groove is positioned with respect to the first through groove in each winding connection portion. The side to be connected is the circumferential direction of the first through groove of the winding connection portion adjacent to one side in the circumferential direction and the first through groove of the winding connection portion adjacent to each other on the other side in the circumferential direction. It is preferable that the first through groove is located on the side where the distance is long. By doing so, the distance between adjacent lands in the circumferential direction can be increased. Therefore, when the windings arranged in the second through groove are soldered to the lands, the solder protrudes not only to the lands of the winding connection portion but also to the lands of the adjacent winding connection portions, and the adjacent winding connection portions are adjacent to each other. It is possible to avoid the situation where the lands of the soldering are connected to each other.

According to the present invention, since it is not necessary to entangle the winding with the terminal pin, the coil and the feeder can be connected by using the wiring board even if the winding has a large winding diameter. Further, since at least a part of the second through groove has a shape toward the outer peripheral side of the wiring board, it is possible to prevent the winding from coming off from the locking portion by inserting the winding into the second through groove. That is, when the winding has a habit of tilting toward the outer peripheral side, the winding is urged to the side opposite to the position where it is connected to the first through groove, so that the winding is urged to the first through groove. Return is suppressed. Further, even when the winding does not have a habit of tilting toward the outer peripheral side, the movement of the winding in the circumferential direction is suppressed in the second through groove. Therefore, since the winding is difficult to move in the second groove, the winding is suppressed from returning to the first through groove. Therefore, since there is little possibility that the winding will come off from the locking portion, the soldering work is easy and the work of connecting the winding to the wiring board is easy.

It is sectional drawing of the motor which concerns on this invention. It is a perspective view of a stator and a wiring board. It is a top view of the stator. It is a top view of the wiring board. It is a perspective view of a winding connection part. It is sectional drawing of the 2nd through groove and winding. It is explanatory drawing which shows the modification of the locking part.

(overall structure)
Hereinafter, embodiments of a motor to which the present invention is applied will be described with reference to the drawings. FIG. 1 is a cross-sectional view of the motor 1 according to the present invention. In the present specification, of one side and the other side of the axial direction L of the motor 1, the side on which the output shaft 100 of the motor 1 protrudes is referred to as the output side L1, and the side opposite to the side on which the output shaft 100 protrudes is defined as the output side L1. It is set to L2 on the non-output side. The output shaft 100 of the motor 1 is provided at the end of the output side L1 of the rotating shaft 10 extending in the axial direction L at the center of the motor 1.

In the motor 1, the motor unit 2, the electromagnetic brake 3, and the encoder 4 are arranged in this order from the output side L1 of the rotary shaft 10 toward the counter-output side L2. The motor unit 2 and the electromagnetic brake 3 are housed in the motor case 5. The encoder 4 is housed inside an encoder cover 6 attached to the end surface of the counter-output side L2 of the motor case 5. The motor to which the present invention is applied is not limited to the motor 1 provided with the motor unit 2, the electromagnetic brake 3, and the encoder 4, and may not be provided with the electromagnetic brake 3 and the encoder 4.

The motor case 5 is made of a metal such as aluminum. The motor case 5 includes a square tubular core holder 51 that surrounds the outer peripheral side of the motor portion 2, a thick bearing holder 52 that is attached to the end of the core holder 51 on the output side, and the outer peripheral side and the non-output side of the electromagnetic brake 3. A brake case 53 surrounding L2 is provided. The rotary shaft 10 is rotatable by an output side bearing 11 held in a recess formed in the center of the bearing holder 52 and a counter-output side bearing 12 held in a recess formed in the center of the bottom of the brake case 53. Be supported. The output side bearing 11 and the non-output side bearing 12 are ball bearings in which a rollable ball is held between the inner ring and the outer ring. The brake case 53 includes a thick bottom portion 54 that holds the counter-output side bearing 12, and a cylindrical portion 55 that rises from the outer peripheral edge of the bottom portion 54 toward the core holder 51.

The rotary shaft 10 includes a motor-side rotary shaft 13 having an output shaft 100 protruding from the bearing holder 52 to the output-side L1, and an encoder-side rotary shaft 14 fixed to the end of the counter-output side L2 of the motor-side rotary shaft 13. Be prepared. The encoder-side rotating shaft 14 projects from the bottom 54 of the brake case 53 to the inside of the encoder cover 6. The motor-side rotary shaft 13 is made of a magnetic material, and the encoder-side rotary shaft 14 is made of a non-magnetic material. The motor-side rotary shaft 13 and the encoder-side rotary shaft 14 may be integrally formed of the same material.

The motor unit 2 includes a rotor 22 in which a magnet 21 is fixed to the outer peripheral surface of the motor-side rotary shaft 13, and a cylindrical stator 23 that surrounds the outer peripheral side of the rotor 22. The stator 23 includes a stator core 24 made of a laminated core and a coil 26 wound around each of a plurality of salient poles 241 provided on the stator core 24 via an insulator 25. A wiring board 8 to which the winding of the coil 26 is connected is arranged on the counter-output side L2 of the stator 23. A lead wire 27 drawn from the wiring take-out portion 56 formed in the motor case 5 to the inside of the motor case 5 is connected to the wiring board 8. The lead wire 27 is a feeder line, and a drive current is supplied from the lead wire 27 to the coil 26 via the wiring board 8.

The encoder 4 is a magnetic encoder, and is magnetically sensitive to an encoder magnet 42 fixed to the tip of a rotating shaft 14 on the encoder side via a magnet holder 41 and an MR element or the like facing the encoder magnet 42 on the opposite output side L2. The element 43 is provided. The encoder magnet 42 has one north pole and one south pole magnetized on the magnetizing surface facing the magnetizing element 43. The sensor board 44 on which the magnetic sensing element 43 is mounted is fixed to the bottom portion 54 of the brake case 53 via the board holder 45. An optical encoder may be used instead of the magnetic encoder.

The electromagnetic brake 3 has an annular friction plate 31 that rotates integrally with the motor-side rotary shaft 13, an annular armature 32 that faces the friction plate 31 on the counter-output side L2, and an annular friction plate 31 that faces the friction plate 31 on the output side L1. An annular plate 33 is provided, and a cylindrical solenoid 34 arranged on the counter-output side L2 of the armature 32 is provided. The solenoid 34 is fixed to the brake case 53 by bolts. The lead wire 35 for feeding power to the solenoid 34 is led out from the wiring take-out section 56 to the outside of the motor case 5 together with the lead wire 27 connected to the motor section 2. The wiring take-out portion 56 includes a notch 561 in which the edge of the counter-output side L2 of the core holder 51 is cut out in the output side L1, and a holder 562 fixed to the outer peripheral surface of the core holder 51 so as to cover the notch 561.

The electromagnetic brake 3 includes a torque spring (not shown) that urges the armature 32 toward the friction plate 31. In the electromagnetic brake 3, when the solenoid 34 is not energized (when not energized), the friction plate 31 is changed to the armature 32 and the plate 3 by the torque spring.
Since it is sandwiched between 3 and 3, a rotational load is applied to the motor-side rotary shaft 13 by the frictional force, and a braking force is generated. Further, when the solenoid 34 is energized (excited), the armature 32 is attracted to the solenoid 34 against the torque spring, so that a gap is generated between the armature 32 and the friction plate 31. Therefore, since the rotational load due to friction is not applied to the rotary shaft 13 on the motor side, the braking force does not act.

(Stator)
FIG. 2 is a perspective view of the stator 23 and the wiring board 8, and FIG. 3 is a plan view of the stator 23. The stator 23 includes twelve salient poles 241 (see FIG. 1), and the number of slots N in which the coil 26 is arranged is 12. Further, the magnet 21 of the rotor 22 is an 8-pole magnetizing magnet in which the outer peripheral surface is divided into 8 poles and the N pole and the S pole are alternately magnetized in the circumferential direction. That is, the motor unit 2 of this embodiment has 8 poles and 12 slots. The number of slots of the stator 23 and the number of magnetic poles of the magnet 21 may be other than 8 poles and 12 slots. For example, it may be 6 poles and 9 slots or 4 poles and 6 slots.

Flange portions are formed at both ends in the radial direction of the insulator 25 attached to each salient pole 241 of the stator core 24. As shown in FIGS. 1 and 2, the flange portions arranged on the radial outer side of the coil 26 are the counter-output side flange portion 251 covering the end surface of the counter-output side L2 of the stator core 24 and the output-side L1 of the stator core 24. The output side flange portion 252 that covers the end face of the is provided. In this embodiment, since the number of salient poles 241 and insulators 25 around which the coil 26 is wound is 12, 12 counter-output side flange portions 251 are arranged in an annular shape.

The motor unit 2 is an AC servomotor, and the stator 23 includes a three-phase coil 26. As shown in FIG. 2, four of the twelve coils 26 are U-phase coils 26U, four of the remaining eight are V-phase coils 26V, and the remaining four are W-phase coils. It is 26W. The U-phase coil 26U, the V-phase coil 26V, and the W-phase coil 26W are arranged in this order in the circumferential direction. The arrangement order of the U phase, the V phase, and the W phase is not limited to such an order, and may be another arrangement order.

From each coil 26, the terminal portions of the two windings 261 on the winding start side and the winding end side are pulled out and connected to the wiring board 8. The winding 261 is drawn out from the outer peripheral end of the coil 26 in the axial direction L. As shown in FIG. 2, the terminal portion of the winding 261 is pulled out from the radial inside of the non-output side flange portion 251 to the other side L2 in the axial direction L. The counter-output side flange portion 251 includes a wall portion 253 that rises from the radial inner edge to the counter-output side L2. The wall portion 253 is formed with concave grooves 254 recessed toward the output side L1 at two locations separated in the circumferential direction. As shown in FIG. 3, the two concave grooves 254 are located equidistant from the center line Q passing through the center of the counter-output side flange portion 251 in the circumferential direction. The center line Q is a straight line passing through the center in the circumferential direction of the coil 26 and the radial center of the stator 23. In FIG. 3, the center line of the coil 26 is shown at only one of the 24 coils 26 (26U, 26V, 26W), and the others are omitted.

In this embodiment, the positions in the circumferential direction of the two concave grooves 254 provided on each wall portion 253 are abbreviated as the pull-out position R from which the terminal portions of the two windings 261 on the winding start side and the winding end side are pulled out. Match. Therefore, as shown by the broken line in FIG. 3, the two windings 261 on the winding start side and the winding end side can be arranged in the concave groove 254 and tilted toward the outer peripheral side. Although only four windings 261 tilted toward the outer peripheral side are shown in FIG. 3, when the wiring board 8 and the winding 261 are connected, all 24 windings 261 are similarly outer peripheral. Tilt to the side.

(Wiring board)
FIG. 4 is a plan view of the wiring board 8. As shown in FIGS. 2 and 4, the wiring board 8 has an annular shape. The wiring board 8 is positioned in the axial direction L by abutting on the wall portion 253 of the counter-output side flange portion 251 of the insulator 25. In this embodiment, as described above, by tilting the winding 261 drawn out from the stator 23 in the axial direction L toward the outer peripheral side, it is possible to secure a space for arranging the wiring board 8 on the counter-output side L2 of the stator 23. .. This makes it possible to avoid interference between the winding 261 and the wiring board 8.

The wiring board 8 includes a winding connection portion 80 to which the winding 261 of the coil 26 is connected. As described above, since the number of coils 26 is 12 in this embodiment, 12 sets of two windings 261 of the terminal portion on the winding start side and the terminal portion on the winding end side are drawn out. Therefore, 24 windings 261 are pulled out from the stator 23, and winding connection portions 80 are provided at 24 locations. The winding connection portion 80 is provided on the outer peripheral edge of the wiring board 8. Each winding connection portion 80 includes a locking portion 81 formed on the outer peripheral edge of the wiring board 8 and a land 82 to which the winding 261 locked to the locking portion 81 is soldered.

As shown in FIG. 4, a plurality of through holes 83 are formed on the outer peripheral edge of the wiring board 8 in a region surrounding each locking portion 81. Further, on the substrate surface of the wiring board 8, lands 84 for connecting the lead wires 27 for power supply are formed at three places. The core wire of the lead wire 27 is soldered to each of the three lands 84. Each land 84 is arranged on the connection wiring pattern 85 formed on the substrate surface of the wiring board 8, and is connected to the connection wiring pattern 85.

The wiring board 8 is a four-layer board in which four wiring layers are laminated via an insulating layer. Three of the four layers are a U-phase wiring layer in which a U-phase wiring pattern to which the U-phase coil 26U is connected is formed, and a V-phase wiring in which a V-phase wiring pattern to which the V-phase coil 26V is connected is formed. It is a W-phase wiring layer in which a W-phase wiring pattern to which a layer and a W-phase coil 26W are connected is formed. The other layer is a surface layer on which the land 84 and the wiring pattern 85 for connection are formed.

FIG. 4 is a plan view of the wiring board 8 as seen from the surface layer side. A part of the through hole 83 is arranged in the forming region of the wiring pattern 85 for connection. Therefore, the pattern of each wiring layer and the pattern of the surface layer are electrically conducted through the conduction portion formed on the inner surface of the through hole 83. Further, a part of the winding connection portion 80 is arranged in the forming region of the wiring pattern 85 for connection. Therefore, by connecting the winding 261 of the coil 26 to the winding connection portion 80, the three-phase coil 26 is connected via the through hole 83 and the connection wiring pattern 85, and the three-phase coil 26 is connected on the connection wiring pattern 85. A drive current is supplied from the lead wire 27 for feeding to the three-phase coil 26 via the land 84.

FIG. 5 is a perspective view of the winding connection portion 80, and is a partially enlarged view of the wiring board 8. The locking portion 81 of each winding connection portion 80 is a groove-shaped notch penetrating the wiring board 8. The locking portion 81 includes a first through groove 811 extending from the outer peripheral end of the wiring board 8 to the inner peripheral side, and a second through groove 812 connected to the inner peripheral end of the first through groove 811. The first through groove 811 extends linearly toward the inner peripheral side of the wiring board 8. The second through groove 812 is connected to the first through groove 811 so as to form an acute angle. The second through groove 812 extends in a direction toward the outer peripheral side of the wiring board 8 toward the side opposite to the connection position P where the first through groove 811 and the second through groove 812 are connected. In other words, the second through groove 812 extends in the direction toward the outer peripheral side of the wiring board 8 toward the tip end side of the second through groove 812.

The two windings 261 drawn from the same coil 26 are connected to two winding connection portions 80 adjacent to each other in the circumferential direction. As shown in FIGS. 4 and 5, of the two winding connection portions 80 to which the winding 261 drawn from the same coil 26 is connected, one side in the circumferential direction is set as the winding connection portion 80CW, and the circumferential direction is used. The other side of the winding connection portion is 80 CCW. The winding connection portion 80CW is located in the clockwise direction CW when viewed from the surface layer side shown in FIG. 4 (that is, when viewed from the counter-output side L2), and the winding connection portion 80CCW is viewed from the surface layer side. It is located in the counterclockwise direction CCW. In this embodiment, 12 sets of winding connection portions 80CW and 80CCW are provided on the wiring board 8.

The locking portion 81 of the winding connection portion 80CW and the locking portion 81 of the winding connection portion 80CCW have a shape symmetrical with respect to the center line Q of the coil 26 connected to the winding connection portions 80CW and 80CCW. .. That is, the first through groove 811 of the winding connection portion 80CW and the first through groove 811 of the winding connection portion 80CCW are arranged at equidistant positions in the circumferential direction from the center line Q and parallel to the center line Q. Extends to. Further, the second through groove 812 provided in one of the winding connection portions 80CW and 80CCW and the second through groove 812 provided in the other extend in the circumferential direction toward opposite sides. The second through groove 812 of the winding connection portion 80CW is located on the opposite side of the center line Q with respect to the first through groove 811 (that is, in the clockwise direction CW). Further, the second through groove 812 of the winding connection portion 80CCW is located on the side opposite to the center line Q (that is, in the counterclockwise direction CCW) with respect to the first through groove 811.

In both the winding connection portions 80CW and 80CCW, the connection position P where the first through groove 811 and the second through groove 812 are connected is the drawing position R (see FIG. 3) from which the winding 261 is pulled out from the coil 26 and the axis. It is a position that overlaps when viewed from the direction L. If the connection position P and the pull-out position R overlap each other when viewed from the axial direction L, when the winding 261 pulled out from the coil 26 is tilted toward the outer peripheral side, the winding 261 and the first through groove that are tilted toward the outer peripheral side are tilted. It is in a state where it overlaps with 811 when viewed from the axial direction L. Further, in the present embodiment, the wall portion 253 of the insulator 25 is formed with a concave groove 254 in which the winding 261 tilted toward the outer peripheral side can be arranged, and the position of the concave groove 254 in the circumferential direction coincides with the withdrawal position R. The concave groove 254 overlaps with the first through groove 811 when viewed from the axial direction L. Therefore, the winding 261 can be easily inserted into the first through groove 811 by raising the winding 261 arranged in the concave groove 254 and tilted toward the outer peripheral side again to the counter-output side L2. Then, when the winding 261 is raised so as to be substantially perpendicular to the wiring board 8, the winding 261 is arranged at the connection position P between the first through groove 811 and the second through groove 812. Therefore, the winding 261 can be easily inserted into the second through groove 812.

In this embodiment, as shown in FIG. 3, the circumferential distance D1 between the two windings 261 drawn from the same coil 26 and the circumferential distance D2 between the two windings 261 drawn from different coils 26. Is different, and D1 is smaller than D2. As described above, the wiring board 8 is configured so that the position in the circumferential direction of the first through groove 811 coincides with the pull-out position R of the winding 261 arranged in the first through groove 811. Therefore, as shown in FIG. 4, the two adjacent winding connection portions 80 connected to the same coil 26 have a circumferential spacing of the first through groove 811 of D1 and are connected to different coils. The distance between the two adjacent winding connection portions 80 in the circumferential direction of the first through groove 811 is D2.

The land 82 is provided on the edge of the second through groove 812. In the present embodiment, the direction in which the second through groove 812 is located with respect to the first through groove 811 is a direction in which the distance between adjacent lands 82 in the circumferential direction becomes large. That is, the side where the second through groove 812 is located with respect to the first through groove 811 is the side where the first through groove 811 on the far side of the first through grooves 811 adjacent in the circumferential direction is located. In other words, the distance in the circumferential direction between the first through groove 811 of the winding connection portion 80 adjacent to each other on one side in the circumferential direction and the first through groove 811 of the winding connection portion 80 adjacent to each other on the other side in the circumferential direction. Is the side on which the first through groove 811 on the far side is located.

In this embodiment, since D1 <D2 as described above, the side of the first through grooves 811 adjacent to each other in the circumferential direction where the far side first through groove 811 is located is the center line Q of the coil 26. It is not on the same side, but on the opposite side in the circumferential direction from the center line Q. Therefore, the second through groove 812 is located on the side opposite to the center line Q with respect to the first through groove 811. As a result, the second through groove 8 adjacent to each other in the circumferential direction is larger than the case where the second through groove 812 is located on the same side as the center line Q with respect to the first through groove 811.
The interval of 12 can be increased. Therefore, the distance between adjacent lands 82 in the circumferential direction can be increased.

As shown in FIG. 5, in each winding connection portion 80, the land 82 to which the winding 261 is soldered is provided on the edge of the tip end portion of the second through groove 812. The land 82 has a circular shape centered on the tip of the second through groove 812. A conductive portion 86 is provided on the inner surface of the second through groove 812. The conductive portion 86 is a conductive metal layer, and is provided on at least a part of the inner surface of the second through groove 812. In this embodiment, the conductive portion 86 extends to the edge of the second through groove 812 and is connected to the land 82. The conductive portion 86 electrically conducts with the pattern of each layer of the wiring board 8 which is a multilayer board and the land 82 provided on the surface layer of the wiring board 8.

When connecting the winding 261 to the winding connecting portion 80, the winding 261 tilted toward the outer peripheral side is raised from the concave groove 254 and opened at the outer peripheral end of the wiring board 8 as shown by an arrow A in FIG. The winding 261 is inserted into the first through groove 811. Then, the winding 261 is inserted into the second through groove 812 via the connection position P between the first through groove 811 and the second through groove 812, and the winding 261 is locked to the locking portion 81. After that, as shown by the broken line in FIG. 5, the terminal portion of the winding 261 is tilted toward the tip end side of the second through groove 812, and the terminal portion of the winding 261 is brought into contact with the land 82 and soldered.

The winding 261 once tilted to the outer peripheral side has a habit of tilting to the outer peripheral side, and stress in the direction of tilting to the outer peripheral side is generated in the winding 261. Therefore, the winding 261 is urged toward the tip end side of the second through groove 812 by this stress. Therefore, since the winding 261 can be easily tilted on the land 82, soldering is easy.

FIG. 6 is a cross-sectional view of the second through groove 812 and the winding 261 and is a partial cross-sectional view of the position BB in FIG. As shown in FIGS. 5 and 6, in the winding 261 the portion arranged in the second through groove 812 extends along the extending direction of the second through groove 812 and with respect to the axial direction L. It extends in the direction of inclination. As shown in FIG. 6, by tilting the winding 261 toward the tip of the second through groove 812, the terminal portion of the winding 261 has an obtuse angle in the vicinity of the contact position with the edge of the tip of the second through groove 812. It bends so as to form an obtuse angle and extends along the surface of the land 82. In this state, the winding 261 is fixed to the land 82 with the solder 9.

As shown in FIG. 5, the through hole 83 arranged in the vicinity of the winding connection portion 80 has a first penetration from a region opposite to the second through groove 812 in the circumferential direction with respect to the first through groove 811. It is arranged over the region on the inner peripheral side of the groove 811 and the second through groove 812. The circular edge surrounding the through hole 83 and the inner surface of the through hole 83 are made of a conductive metal. The pattern of each layer provided on the wiring board 8 and the wiring pattern 85 for connection provided on the surface layer are electrically conducted through the through holes 83.

(Main effect of this form)
As described above, the motor 1 of the present embodiment supplies the drive current to the coil 26 of the stator 23 via the wiring board 8. The winding 261 of the coil 26 is soldered to the land 82 in a state of being locked to the locking portion 81 of the wiring board 8. Therefore, since it is not necessary to entangle the winding 261 with the terminal pin, the coil 26 and the lead wire 27 can be connected by using the wiring board 8 even if the winding 261 has a large winding diameter. Further, the locking portion 81 includes a first through groove 811 extending from the outer peripheral end of the wiring board 8 to the inner peripheral side and a second through groove 812 connected to the first through groove 811, and at least the second through groove 812. A part of the wiring board 8 extends toward the outer peripheral side of the wiring board 8 toward the side opposite to the side of the connection position P connected to the first through groove 811. As described above, if at least a part of the second through groove 812 is shaped toward the outer peripheral side of the wiring board 8, the winding 261 is disengaged from the locking portion 81 by inserting the winding 261 into the second through groove 812. Can be suppressed. That is, when the winding 261 has a habit of tilting toward the outer peripheral side, the winding 261 is urged to the side opposite to the connection position P, so that the winding 261 is moved to the first through groove 811. Return is suppressed. Even when the winding 261 does not have a habit of tilting toward the outer peripheral side, the movement of the winding 261 in the circumferential direction is suppressed in the second through groove 812. Therefore, since the winding 261 is difficult to move in the second through groove 812, the winding 261 is suppressed from returning to the first through groove 811. Therefore, since there is little possibility that the winding 261 will come off from the locking portion 81, the soldering work is easy, and the work of connecting the winding 261 to the wiring board 8 is easy.

In this embodiment, the land 82 of the winding connection portion 80 is provided on the edge of the second through groove 812 and is connected to the conduction portion 86 provided on the inner surface of the second through groove 812. Therefore, the land 82 and the winding 261 can be easily brought into contact with each other by tilting the winding 261. Further, the pattern provided on each layer of the wiring board 8 and the winding 261 can be electrically connected via the conductive portion 86. Therefore, the current capacity can be increased. Further, since the winding 261 can be soldered not only to the land 82 but also to the inner surface of the second through groove 812, the fixing strength of the winding 261 can be improved.

In the wiring board 8 of this embodiment, a through hole 83 is formed in a region surrounding the locking portion 81. Therefore, the pattern of each layer on the wiring board 8 and the winding 261 can be electrically connected via the through hole 83. Therefore, the current capacity can be increased.

In the present embodiment, the connection position P where the first through groove 811 and the second through groove 812 are connected is a position where the winding 261 is pulled out from the coil 26 and overlaps with the drawing position R when viewed from the axial direction L. Therefore, since it is easy to insert the winding 261 to the entrance of the second through groove 812, it is easy to lock the winding 261 to the second through groove 812. Further, it is difficult for the winding 261 to return to the entrance side of the first through groove 811. Therefore, the winding 261 does not easily come off from the locking portion 81. Therefore, the soldering work is easy, and the work of connecting the winding 261 to the wiring board 8 is easy. For example, after all the windings 261 are arranged in the notch, they can be soldered together. Therefore, it is possible to efficiently solder the plurality of windings 261.

In this embodiment, the insulator 25 is provided with a wall portion 253 arranged on the outer peripheral side of the coil 26, and the wall portion 253 includes a concave groove 254 in which a winding 261 drawn out to the outer peripheral side of the wall portion 253 is arranged. The concave groove 254 overlaps with the first through groove 811 when viewed from the axial direction L. As a result, it is possible to prevent the insulator 25 and the winding 261 from interfering with each other when the winding 261 is tilted toward the outer peripheral side and the wiring board 8 is arranged. Further, since the concave groove 254 and the first through groove 811 overlap each other when viewed from the axial direction L, the winding 261 can be easily inserted into the first through groove 811.

In this embodiment, the winding 261 is tilted toward the tip end side of the second through groove 812 in the second through groove 812, and extends in the second through groove 812 in the extending direction of the second through groove 812. Since at least a part of the land 82 is provided on the tip end side of the second through groove 812, the winding 261 tilted toward the tip end side of the second through groove 812 is arranged on the land 82. As described above, in this embodiment, the winding 261 is tilted toward the tip end side of the second through groove 812, and the winding 261 is tilted in the second through groove 812 with respect to the plate thickness direction of the wiring board 8. It has become. Therefore, it is not necessary to bend the winding 261 at a substantially right angle in order to bring the winding 261 into contact with the land 82, and it is sufficient to bend the winding 261 at an obtuse angle. Therefore, since the stress applied to the winding 261 is small, the soldered winding 261 does not easily come off from the land 82. Further, when the conductive portion 86 is provided on the inner surface of the second through groove 812, the contact area with the conductive portion 86 can be increased. Further, since the winding 261 extends in the extending direction of the second through groove 812 in the second through groove 812, the second through groove 812 has a large range to be closed by the winding 261. Therefore, it is possible to reduce the possibility of solder dripping from the second through groove 812 toward the stator 23 side.

The wiring board 8 of this embodiment is provided with a plurality of winding connection portions 80 having a locking portion 81 and a land 82, and in each winding connection portion 80, a second through groove 812 is provided with respect to the first through groove 811. The position side is the circumferential direction among the first through groove 811 of the winding connection portion 80 adjacent to each other on one side in the circumferential direction and the first through groove 811 of the winding connection portion 80 adjacent to each other on the other side in the circumferential direction. This is the side where the first through groove 811 is located on the side where the distance is long. As a result, the second through groove 812 can be arranged on the side where the distance from the adjacent lands 82 in the circumferential direction increases. Therefore, when the winding 261 arranged in the second through groove 812 is soldered to the land 82, the solder protrudes not only to the land 82 of the winding connection portion 80 but also to the land 82 of the adjacent winding connection portion 80. Therefore, it is possible to avoid a situation in which the lands 82 of the adjacent winding connection portions 80 are electrically connected to each other.

(Modification example)
(1) FIG. 7 is an explanatory diagram showing a modified example of the locking portion. FIG. 7A is a locking portion 81A provided with a linear first through groove 811 extending in the radial direction and a semicircular second through groove 812A. FIG. 7B is a locking portion 81B provided with a linear first through groove 811 extending in the radial direction and a second through groove 812B connected to an end portion on the inner peripheral side of the first through groove 811. .. The second through groove 812B includes a first portion 813 extending in the circumferential direction from the end on the inner peripheral side of the first through groove 811 and a second portion 814 extending from the first portion 813 so as to bend toward the outer peripheral side. FIG. 7C has a linear first through groove 811C extending in a direction inclined with respect to the radial direction and a second through groove 812C connected to the first through groove 811 so as to form an obtuse angle. The stop 81C. In any of FIGS. 7A to 7C, at least a part of the second through grooves 812A, 812B, and 812C extends toward the outer peripheral side toward the side opposite to the side connected to the first through groove 811. ing. Therefore, similarly to the above embodiment, it is possible to suppress the winding 261 from returning to the first through grooves 811 and 811C, and it is possible to suppress the winding 261 from being disengaged from the locking portions 81A, 81B and 81C. Therefore, the soldering work is easy, and the work of connecting the winding 261 to the wiring board 8 is easy.

(2) In the above embodiment, the winding 261 inserted in the second through groove 812 is tilted toward the outer peripheral side and soldered to the land 82, but the winding 261 is left standing without tilting. Soldering may be performed with the winding 261 standing upright. In this case, a conductive portion 86 is provided on the inner surface of the first through groove 811 and the second through groove 812 so as to be in contact with the winding 261, and the conductive portion 86 is used as a land and the winding 261 is soldered to the land. do it.

1 ... motor, 2 ... motor part, 3 ... electromagnetic brake, 4 ... encoder, 5 ... motor case, 6 ... encoder cover, 8 ... wiring board, 9 ... solder, 10 ... rotating shaft, 11 ... output side bearing, 12 ... Non-output side bearing, 13 ... motor side rotating shaft, 14 ... encoder side rotating shaft, 21 ... magnet, 22 ... rotor, 23 ... stator, 24 ... stator core, 25 ... insulator, 26 ... coil, 26U ... U-phase coil, 26V ... V-phase coil, 26W ... W-phase coil, 27 ... lead wire, 31 ... friction plate, 32 ... armature, 33 ... plate, 34 ... solenoid, 35 ... lead wire, 41 ... magnet holder, 42 ... encoder magnet, 43 ... Magnetic element, 44 ... sensor board, 45 ... board holder, 51 ... core holder, 52 ... bearing holder, 53 ... brake case, 54 ... bottom, 55 ... tubular part, 56 ... wiring take-out part, 80, 80CW, 80CCW ... Winding connection part, 81, 81A, 81B, 81C ... Locking part, 82 ... Land, 83 ... Through hole, 84 ... Land, 85 ... Connection wiring pattern, 86 ... Conduction part, 100 ... Output shaft, 241 ... Pole, 251 ... anti-output side flange, 252 ... output side flange, 253 ... wall, 254 ... concave groove, 261 ... winding, 561 ... notch, 562 ... holder, 811, 811C ... first through groove, 812, 812A, 812B, 812C ... 2nd through groove, 813 ... 1st part, 814 ... 2nd part, CCW ... counterclockwise direction, CW ... clockwise direction, D1 ... 2 windings drawn from the same coil Circumferential spacing of wire 261, D2 ... Circumferential spacing of two windings 261 drawn from different coils, L ... axial direction, L1 ... output side, L2 ... non-output side, P ... connection position, Q ... Coil center line, R ... Winding lead position

Claims (6)

A stator core with multiple salient poles, and a stator with a coil wound around each salient pole via an insulator.
It has a feeding line through which a drive current supplied to the coil flows and a wiring board connecting the winding of the coil.
The wiring board is provided with a locking portion where the winding is locked and a land on which the winding is soldered.
The locking portion includes a first through groove cut out from the outer peripheral end of the wiring board toward the inner peripheral side.
A second through groove connected to the inner peripheral end of the first through groove is provided.
At least a part of the second through groove extends in a direction toward the outer peripheral side of the wiring board as it goes toward the side opposite to the side connected to the first through groove.
The wiring board includes a plurality of through holes formed in a region surrounding the locking portion.
The plurality of through holes extend from a region opposite to the second through groove in the circumferential direction with respect to the first through groove to a region on the inner peripheral side of the first through groove and the second through groove. A motor characterized by being arranged . The motor according to claim 1, wherein the land is provided on the edge of the second through groove and is connected to a conductive portion provided on the inner surface of the second through groove. Claim 1 is characterized in that the position where the first through groove and the second through groove are connected is a position which overlaps with a drawing position where the winding is pulled out from the coil when viewed from the axial direction of the stator. Or the motor according to 2. The insulator includes a wall portion arranged on the outer peripheral side of the coil.
The wall portion comprises a concave groove in which the winding wire drawn out to the outer peripheral side of the wall portion is arranged.
The motor according to claim 3, wherein the concave groove overlaps with the first through groove when viewed from the axial direction . The winding is tilted toward the tip end side of the second through groove, extends in the second through groove in the extending direction of the second through groove, and extends in the extending direction of the second through groove.
The motor according to any one of claims 1 to 4, wherein at least a part of the land is provided on the tip end side of the second through groove . The wiring board is provided with a plurality of winding connection portions having the locking portion and the land.
In each winding connection portion, the side where the second through groove is located with respect to the first through groove is the first through groove of the winding connection portion adjacent to one side in the circumferential direction and the other in the circumferential direction. Any of claims 1 to 5 , wherein the first through groove on the side where the distance in the circumferential direction is far is located among the first through grooves of the winding connection portions adjacent to each other on the side . The motor according to one item.

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